95 Chevy Blazer

SPONGER

MEMBER
1995 CHEVROLET TRUCK

I have 95 Chevy Blazer 4.3L I had posted a question asking weather I had an OBD 1 or 2. I found out I had an OBD 2 which goes against the "96 or newer has an OBD 2 rule". Anyhow, I bought an Actron pocket scanner and pulled three codes. P0134, P0141, and P1406. I have the first two codes figured out. They are O2 sensor issues. The third code refers to and I quote from the CD that came with the scanner: "Manufacturer Contrl Auxiliary emission Controls" the caps and spelling were exactly as I have it in quotes. The CD doesn't give me any explanation and neither does my Haynes manual nor my owner manual. Do you have any insight to this?

2 Replies

SDALTON19

MECHANIC
87 POSTS

First of all I dont know who told you 96 and up were all obd2 thats not true ford started testing the american version of the obd2 as early as 93 and used in 94 I know some foriegn car manufacturers started even earlier than that second about your codes p1406 is an egr pintle issue more than likely (and these vehicles were notorious for this) the egr valve has been jammed by a clump of broken carbon maybe as simple as taking it apart and cleaning it or could be a faulty valve or wiring. Third i'm not convinced the other 2 codes mean that the oxygen sensors are bad seems strange to me that both o2 sensors are failing on one side you might want to take a look at the fuel injection system I believe has a spider style injector that was real bad about leaking fuel and could cause those 2 codes to set if you need more info about this just ask